Interactions of Salmonella enterica with lettuce leaves.

Abstract:

AIMS:To investigate the interactions of Salmonella enterica with abiotic and plant surfaces and their effect on the tolerance of the pathogen to various stressors. METHODS AND RESULTS:Salmonella strains were tested for their ability to form biofilm in various growth media using a polystyrene plate model. Strong biofilm producers were found to attach better to intact Romaine lettuce leaf tissue compared to weak producers. Confocal microscopy and viable count studies revealed preferential attachment of Salmonella to cut-regions of the leaf after 2 h at 25 degrees C, but not for 18 h at 4 degrees C. Storage of intact lettuce pieces contaminated with Salmonella for 9 days at 4 degrees C resulted only in small changes in population size. Exposure of lettuce-associated Salmonella cells to acidic conditions (pH 3.0) revealed increased tolerance of the attached vs planktonic bacteria. CONCLUSIONS:Biofilm formation on polystyrene may provide a suitable model to predict the initial interaction of Salmonella with cut Romaine lettuce leaves. Association of the pathogen with lettuce leaves facilitates its persistence during storage and enhances its acid tolerance. SIGNIFICANCE AND IMPACT OF THE STUDY:Understanding the interactions between foodborne pathogens and lettuce might be useful in developing new approaches to prevent fresh produce-associated outbreaks.

journal_name

J Appl Microbiol

authors

Kroupitski Y,Pinto R,Brandl MT,Belausov E,Sela S

doi

10.1111/j.1365-2672.2009.04152.x

subject

Has Abstract

pub_date

2009-06-01 00:00:00

pages

1876-85

issue

6

eissn

1364-5072

issn

1365-2672

pii

JAM4152

journal_volume

106

pub_type

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